Fireproof building



March 8,1927.

H. SORENSEN FIREPRO OF BUILDING Filed Dec. '7, 1925 INVENTOR PatentedMar. 8, 1927.

tin-tr an s mrns PATENT oeFicE.

HENRY? SORENSEEN, OF? SAN ERANCISCQ'. CALIFORNIA-2.

rinnraoor BUILDING.

Application filed. December 7, 1925. Serial No. 73,717.

tionl,

' 2 is a cross-section of Fig.1 1 at cZ-'(Z. Onythe one half offthissection-I have shown form 1, placed on joists from flange to flangeofjframe 18, upon which the fireproof ma-. terial 1O isp oured. i 1

Fig. 3 is a-longitudinal section ofFig. lnat ee..

Fig. 4 is anenlarged cross-section of a pair'of bands 2, with thefragment of a longitudinal-section of" bands 3, showing the slfopingendof '3 resting on the sloping side J4. V 1

Fig. .5 is alongitudina-l enlargement show? ingcthefragment of'aslopingrend of'reinforceinent ISJrestingVon the sloping side of b'andi3, .witha, crosscn-t sectionof another reinforcen'ient 15; running between bands'2, placedover: the longitudinal fragment.

Fig: .6fis an enlarged cross-section of Fig", 1,. at. f'f,. showing, howseveral pairs of bands 2'may be adc'led'together. to obtain greaterstrength. Pins \17 hold the pairs of bandsl2, apart to allow thefireproof material to flow through, openings 11;

Fig. .7'is an. enlarged section of'th'e stretching andalockingrdevice 19showing vthe various. detailmf 19; herein described; with 19 and thefragment of 'a.p air of bands 2 embedded in the fireproof'material 10.

Fig. 8 is a plan yiew of Fig. 7.

In the drawingsuwhere similar numerals indicate: similar parts,numeralsl designate the forms for the concrete. Numerals 2 designatemain wedgeshaped pairs of steel bands, orfiat steel bars.- which.together with their intervening concrete filling 16. form the main wed'esh ap ed supports which car-11v the doors; Numerals 3 designatelateral wedgeshaped pairs of steels bands, which, together. with their,intervening" concrete filling 16;for1nthe lateral wedgeshapedrsup portswhich carry the floors. Numerals 4 designateflanges connected with bands2 and: with-bands 3. Numerals 5 designate holes in bands 2. 'Bolts 6pass through holes 5. pairs of wedgeshaped bands 3. I place bandreinforcements 15 between the pairs. of fmain bands 2 or between thepairs of lateral bands 3, or between both. Numerals. 10 designate theconcrete. Flanges tareformed by a sharp bend along; the one. edge ofhand" 2 and band 3,' and form an acute angle i. e. an angle which isless than 90.

After having dealt with the above "I- am now coming? to the final stepin my inven+ tion. which enables me to cut i down on weight, andincrease the room height5 in fireproofbuildings.

Thereinforceinent steel bands 2-carry the other reinforcements. 3 andThese'bands 2 stretch between the mainisteel frame 18 as shown in Fig.1, and the final stepi to which I. have referred consists in rigidlyanchoring said steel bands 2 to said frame 18; and to effectively do soI usean anchoring device whicliisadjnstable whereby I can properlystretclrbands 2-, when anchoring bands 2 "to frame 18. Byth-isstretching method I immediately bring into eft'ectthe tensileresistance of the steel in bands 2, when the; load is. appliedy withoutfirst having to takeup'any slack in bands" 2. should bands 2 not beproperly tightened. In oth'er words I' add the application o-f'the saidtensile resistance, causedby saida-nchoring, to that resistance, againstbuckling, which is obtainedby themere embedding of the reinforcements-inthe fireproof material.

In 1, which is a plan view of my invent-ion, I have shown that thefireproof materiallO, which may be concrete or any other suitablemateriah rests on the rectangular seats 9, and that themainreinforcement, bands 2; carry said rectangular seats 9, and take up thetension caused by the weightof the floors. Numerals 18 designate. thesteel frame of vthe building. Numerals designate the steel columns whichsupport frame 18. -Nn1nerals 1 designate the form upon which thefireproof material'10 is poured. Numerals 2; designate main pairs ofwedgeshaped-bands, which, together with the lateral pairs of wedgeshapedbands 3,- form the rectangular wedgeshaped seats-9i The .floor Mainbands 2' support the lateral fireproof material 10 rests on seats 9. 15designates reinforcements inside of the wedgeshaped seats 9. Numerals 16indicate space, inside of the pairs of bands 2 and 3,

into which fireproof material 10 is inserted. 11 designate openings,between the spaced pairs of bands 2 and 3, through which the fireproofmaterial 10 is filled into 16. Numerals l designate flanges, on bands2and on hands 3. which hold the filing 16 in place. The ends of the bandreinforcements 3 have sloping ends adapted to rest on the sloping sidesof bands 2. and the ends of reinforcements 15 have sloping ends adaptedto rest on the sloping sides of seats 9. Numerals 19 designate anadjustable locking device, whereby I rigidly anchor bands 2 to steelframe 18. Said locking device consists of:

Clamps 20 having clasp 21 and flange 22; hook 23 which is attached tobands 2 by means of bolt 6 which passes through hole 5; and wedges 243.Bands 2 rest on the elongations 26 of 20.

Clasp 21 has a solid grip on the steel frame 18 as shown in thedrawings. I Flange 22 and hook 23 overlap each other. Wedge 24 isinserted between flange 22 and hook 23.

The base of wedge 24 rests against flange 22,

and, when wedge 24: is driven, the sloping sides of wedge 24 willtighten hook 23.

When the pairs of reinforcement bands 2,

the pairs of reinforcement bands 3, which together form seats 9, thereinforcements 15, and the locking device 19 are in place, wedges 2a aredriven, whereupon bands 2 tighten and become rigidly anchored to thesteel frame 18. By driving wedges 24L re inforcements 2 are initiallytensioned and locked to frame 18 before the infilling 10 is poured.

The fireproof material 10 is thereupon poured, and 2, 3. 15 and 19become embedded in the fireproof material 10. After the lireproofmaterial has set. and after the forms 1 are removed, the fireproof floorstretches between, and rests on. the top of the flanges of frame 18. Theadjustable locking device 19 is greatly strengthened by being embeddedin the fireproof "material 10.

By the stretching process of bands 2, which, as described, rigidlyanchors the same to the steel frame 18. I obtain the grip, whichimmediately brings the tensile strength of the steel bands 2 into play,when the Weight on the floors is applied. That grip, which is created bysaid anchoring, is entirely independent of the grip, which the fireproofmaterial has on hands 2 due to the cohesion between the fireproofmaterial and the steel, and which ceases to exist if the fireproofmaterial slips on the steel. The added grip, caused by the stretchingprocess of the anchoring of bands 2 to the steel frame 18, gives anadditional margin of safety, which makes it justifiable to cut down onthe steel and reduce the thickness of the floors, and thereby increasethe height of the rooms.

It is evident that I can apply the herein described process, to stretchand lock the reinforcement bands, equally well in floors and beams ofconcrete buildings as in steel frame buildings.

Other modifications of construction may be made without departing fromthe spirit of my invention.

I claim:

1. In the wedgeshaped band reinforcements of an infilled floor structuremeans connecting said band reinforcements with the supports of saidstructure, said means adapted to stretch said bands, whereby said bandreinforcements are put into tension and interlocked with said supportsbefore the infilling takes place.

2. In the reinforcements of an infilled fioor structure main pairs ofwedgeshaped bands in combination with lateral pairs of wedgeshapedbands, said lateral bands having slopingends adapted to rest on thesloping sides of said bands, and means whereby said main hands arestretched and interlocked with the supports of said structure before theinfilling takes place. p

3. In the reinforcements of an infilled floor structure main pairs ofwedgeshaped bands in combination with lateral pairs of wedgeshapedbands, said lateral bands having sloping ends adapted to rest on thesloping sides of said main bands, members attached to said main bandsand overlapping the supports of said structure, and wedges drivenbetween the overlapping parts of said members and said supports, wherebysaid main bands are put into tension and interloclred with said supportsbefore the infilling takes lace.

1. n a fireproof building main pairs of spaced wedgeshaped bands incombination with lateral pairs of spaced Wedgeshaped bands, said lateralbands extending between said main bands and having sloping ends adaptedto rest on the slopingsides of said main bands, whereby rectangularwedgeshaped seats are formed to carry the'fireproof material, means tohold said fireproof material in place inside of said pairs of bands,reinforcements intermediate the sloping sides of said rectangular seats,said pairs of main bands extending between the supporting frame of saidbuilding, and means whereby said main bands are stretched and rigidlyanchored to said frame.

5. In a fireproof building main pairs of spaced wedgeshaped bands incombination with lateral pairs of spaced wedgeshaped bands, said lateralbands extending between said main bands and having sloping ends. adaptedto rest on the sloping sides of said main bands, whereby rectangularWedgeshaped seats are formed to hold the fireproof material, means tohold fireproof filling in place inside of said pairs of bands,reinforcements having sloping ends adapted to rest on the sloping sidesof saidrectangular seats, said pairs of main bands extending between thesupporting frame of said building,

flanges attached to said supporting frame, hooks connected with saidniain bands, said hooks and said flanges overlapping each 10 other andWedges intermediate said flanges and said hooks.

HENRY SORENSEN.

